Blizzard Warnings remain posted for much of western and west-central South Dakota. Snow, even heavy snow continues to fly in the same area. Winds continue to gust above 60 mph in the northwestern counties. We expect even more records to fall by day’s end. Spearfish, Deadwood, Lead, Rapid City and many others shattered records for October snowfall.
Let’s take Rapid City as an example. Prior to yesterday, the one-day October snowfall record was 7.3”. Since the snow started Thursday night, the OFFICIAL mark is 18.3”. Some around town have seen MUCH more while others to the north picked up less. Lead has 43.5” and is still counting. As of this writing, Interstate 90 remains closed between Murdo and the Wyoming border.
The snow line is moving eastwards very slowly. The eastern edge is moving back towards Pierre and the change-over will go from rain to snow quickly. There is still plenty of moisture left in this storm, even though it’s been ongoing for 36+ hours. Again, several more inches of snowfall are possible, both in the Hills and on the Plains.
Sioux Falls is in a much different spot this morning. Severe weather was all around the city last night and six tornadoes were spotted in SE KELOLAND (that’s still a preliminary number). Moville, Quimby, Jefferson and other towns are still accounting for damage as the sun comes up today. As we’ve been saying for awhile now, dry air is cutting north into the system. That accounts for the partly cloudy skies in Sioux Falls early on today. That’s also why Sioux Falls and the southeast have a much lower chance of rain today, compared to those in Aberdeen and Pierre. Winds will be lighter, as well, since we’re near the center of the low.
Aberdeen’s already seen a good rain early this morning and more should arrive later today. Most of what we see during the day will be rain but by tonight, temps will cool, and we’ll see the transition over to a slushy mix from west to east.
Skies clear this evening/overnight in the Black Hills. There will still be some breeze around to blow existing snow around although most FRESH snow will be done. We expect a COLD night in Rapid City and clear skies only enhance that. Pierre should see some moisture lasting through evening although much of the system will be pushing East River by late in the overnight period. Sioux Falls’ best chance for rain will be tonight, as well.
Tomorrow will be a warmer day. Showers linger through early afternoon in the far eastern counties. We’re expecting a noticeable warm-up for all, especially those in the west. That’s of course tempered by snowfall; areas high in the Hills with several inches of snow will be considerably cooler than those in the foothills.
Heading into Tuesday, there’s a sharp warming trend in the extended forecast. We get back to a late-summer feel.